for Japanese


1 February, 2019

JAEA Achieves 150 Hours of Continuous Hydrogen Production Toward Utilization of Heat from HTGRs

On January 25, the Japan Atomic Energy Agency (JAEA) announced that it had succeeded in producing hydrogen continuously for 150 hours using a thermal-chemical iodine-sulfur (IS) process that JAEA developed to more efficiently utilize the heat supply capabilities of high-temperature gas-cooled reactors (HTGRs).  

JAIF President Takahashi visited HTTR reactor building (April 2018)

The thermochemical IS process combines three reactions using iodine (I) and sulfur (S) – sulfate degradation, a Bunsen reaction, and hydrogen iodide decomposition. It produces hydrogen by splitting water (an abundant resource) into H2 and O2 using heat generated without CO2 emissions. Moreover, the iodine and sulfur are circulated within the system, emitting no waste to the outside environment.

At the same time, given that extremely corrosive liquids such as sulfuric acid are used at high temperatures, for commercial use, it was necessary to develop technology for manufacturing equipment/facilities to identify materials suitable for different conditions and to validate their reliability. JAEA successfully developed durable reactor vessels for each reaction process.

Three years ago, in 2016, JAEA succeeded in in test-producing hydrogen, making about ten liters per hour for eight hours. After further development of elemental technology toward more stable production of hydrogen, JAEA has now succeeded in continuous production of hydrogen for 150 hours (at about 30 liters/hour), a milestone in long-duration operation.

[clizk to zoom] Mechanism of IS processes (quoted from materials released by the Ministry of Education, Culture, Sports, Science and Technology (MEXT))







JAEA will continue to accumulate operational data and carry out R&D toward practical use of the system to produce large amounts of hydrogen in a stable manner, including automatic operations control. It aims next at a demonstration of hydrogen production using the High-Temperature Engineering Test Reactor (HTTR). HTTR is now ALSO undergoing a safety compatibility examination under the new regulatory standards by the Nuclear Regulation Authority (NRA).





This site uses Akismet to reduce spam. Learn how your comment data is processed.

SNS facebooktwitter

NPPs Map


“The current situation at Fukushima Daiichi NPS” -From 3.11 toward the future- (ver, July 2019)

8 July, 2019
“The current situation at Fukushima Daiichi NPS” -From 3.11 toward the future- (ver, July 2019)09:17

Recent News

17 October, 2019
JAIF Holds Women’s Symposium, with Presentations by Weathercaster and Professor
7 October, 2019
Fukushima Joban Products Fair Begins, Featuring Seafood Sent Directly to Restaurants in Tokyo-Yokohama Area
3 October, 2019
Kindai University, Hayakawa Rubber Develop Easily-molded Radiation Shielding Material
30 September, 2019
MEXT Minister Shares His Hopes with the Press, Seeking to Secure Human Resources Together with Universities
19 September, 2019
Minister of State for Science and Technology Policy Attends Opening Ceremony of Japan Booth at IAEA General Conference
19 September, 2019
At 63rd IAEA General Conference, Japanese Minister of State for Science and Technology Policy Stresses Need for Science-based Discussions on Decommissioning and Contaminated Water Measures
10 September, 2019
Symposium in Tokyo Looks at Taiwanese Energy Situation, and Discusses Fear and Misinformation about Foods Sourced in Fukushima
10 September, 2019
Kyushu Electric Power Files Decommissioning Plan for Genkai-2 and Seeks Change to Genkai-1 Plan, with Work on Both to Proceed Simultaneously
4 September, 2019
White Paper on Nuclear Energy Features Decommissioning, Accumulation of Technology as “Great Assets” for the Future
29 August, 2019
TEPCO to Decide Fate of Kashiwazaki Kariwa Units 1 to 5 Five Years after Restarting Units 6 and 7